merchant

Merchant backend to process payments, run by merchants
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select_accounts_by_exchange.c (4122B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022 Taler Systems SA
      4 
      5    TALER is free software; you can redistribute it and/or modify it under the
      6    terms of the GNU General Public License as published by the Free Software
      7    Foundation; either version 3, or (at your option) any later version.
      8 
      9    TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
     12 
     13    You should have received a copy of the GNU General Public License along with
     14    TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15  */
     16 /**
     17  * @file src/backenddb/select_accounts_by_exchange.c
     18  * @brief Implementation of the select_accounts_by_exchange function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "platform.h"
     22 #include <taler/taler_pq_lib.h>
     23 #include "merchant-database/select_accounts_by_exchange.h"
     24 #include "helper.h"
     25 
     26 
     27 /**
     28  * Closure for #parse_accounts.
     29  */
     30 struct SelectAccountContext
     31 {
     32   /**
     33    * Function to call on each result.
     34    */
     35   TALER_MERCHANTDB_ExchangeAccountCallback cb;
     36 
     37   /**
     38    * Closure for @e cb.
     39    */
     40   void *cb_cls;
     41 
     42   /**
     43    * Set to true on failure.
     44    */
     45   bool failed;
     46 };
     47 
     48 /**
     49  * Function to be called with the results of a SELECT statement
     50  * that has returned @a num_results results about accounts.
     51  *
     52  * @param cls of type `struct SelectAccountContext *`
     53  * @param result the postgres result
     54  * @param num_results the number of results in @a result
     55  */
     56 static void
     57 parse_accounts (void *cls,
     58                 PGresult *result,
     59                 unsigned int num_results)
     60 {
     61   struct SelectAccountContext *ctx = cls;
     62 
     63   for (unsigned int i = 0; i < num_results; i++)
     64   {
     65     struct TALER_FullPayto payto_uri;
     66     char *conversion_url = NULL;
     67     json_t *debit_restrictions;
     68     json_t *credit_restrictions;
     69     struct TALER_MasterSignatureP master_sig;
     70     struct GNUNET_PQ_ResultSpec rs[] = {
     71       GNUNET_PQ_result_spec_auto_from_type ("master_sig",
     72                                             &master_sig),
     73       GNUNET_PQ_result_spec_string ("payto_uri",
     74                                     &payto_uri.full_payto),
     75       GNUNET_PQ_result_spec_allow_null (
     76         GNUNET_PQ_result_spec_string ("conversion_url",
     77                                       &conversion_url),
     78         NULL),
     79       TALER_PQ_result_spec_json ("debit_restrictions",
     80                                  &debit_restrictions),
     81       TALER_PQ_result_spec_json ("credit_restrictions",
     82                                  &credit_restrictions),
     83       GNUNET_PQ_result_spec_end
     84     };
     85 
     86     if (GNUNET_OK !=
     87         GNUNET_PQ_extract_result (result,
     88                                   rs,
     89                                   i))
     90     {
     91       GNUNET_break (0);
     92       ctx->failed = true;
     93       return;
     94     }
     95     ctx->cb (ctx->cb_cls,
     96              payto_uri,
     97              conversion_url,
     98              debit_restrictions,
     99              credit_restrictions,
    100              &master_sig);
    101     GNUNET_PQ_cleanup_result (rs);
    102   }
    103 }
    104 
    105 
    106 enum GNUNET_DB_QueryStatus
    107 TALER_MERCHANTDB_select_accounts_by_exchange (
    108   struct TALER_MERCHANTDB_PostgresContext *pg,
    109   const struct TALER_MasterPublicKeyP *master_pub,
    110   TALER_MERCHANTDB_ExchangeAccountCallback cb,
    111   void *cb_cls)
    112 {
    113   struct SelectAccountContext ctx = {
    114     .cb = cb,
    115     .cb_cls = cb_cls
    116   };
    117   struct GNUNET_PQ_QueryParam params[] = {
    118     GNUNET_PQ_query_param_auto_from_type (master_pub),
    119     GNUNET_PQ_query_param_end
    120   };
    121   enum GNUNET_DB_QueryStatus qs;
    122 
    123   check_connection (pg);
    124   PREPARE (pg,
    125            "select_exchange_accounts",
    126            "SELECT"
    127            " payto_uri"
    128            ",conversion_url"
    129            ",debit_restrictions::TEXT"
    130            ",credit_restrictions::TEXT"
    131            ",master_sig"
    132            " FROM merchant_exchange_accounts"
    133            " WHERE master_pub=$1;");
    134   qs = GNUNET_PQ_eval_prepared_multi_select (
    135     pg->conn,
    136     "select_exchange_accounts",
    137     params,
    138     &parse_accounts,
    139     &ctx);
    140   if (ctx.failed)
    141     return GNUNET_DB_STATUS_HARD_ERROR;
    142   return qs;
    143 }